By Ken Lassey
I have a service that requires mysql to be fully up and running before it starts otherwise it fails. I have very alrge mysql databases and mysqld takes up to 40 minutes before entering an active (running) state.
I have tried adding After=mysqld.service in the secondary services .service file {unit] section without success. It starts my secondary service ass soon as mysqld is enabled. I have tried using Wants=mysqld.service and Requires=mysqld.service without success.
Any help or suggesstions would be appreciated.
Thank you
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Generally, to declare a strict dependency, you will want both After and Requires:
[Unit]
Description=My application
After=mysqld.service
Requires=mysqld.service
If for some reason you’re still not have the expected behavior, another option would be to use a script in ExecStartPre that blocks until it can connect to the database. wait-for-it is a useful tool for this: https://github.com/vishnubob/wait-for-it
For more info on working with systemd unit files, check out:
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